(19)

(11)

EP 0 086 223 A1

(12)

(43) Date of publication: 24.08.1983 Bulletin 1983/34 (21) Application number: 82902850.0 (22) Date of filing: 17.08.1982

(51) International Patent Classification (IPC):  H04Q 11/ 04( . ) H04L 12/ 417( . ) (86) International application number: PCT/US1982/001117 (87) International publication number: WO 1983/000788 (03.03.1983 Gazette 1983/06)

(84) Designated Contracting States: AT BE CH DE FR GB LI LU NL SE (30) Priority: 20.08.1981 US 19810294745 (71) Applicants: TOBAGI, Fouad A Los Altos, CA 94022 (US) FRATTA, Luigi I-20090 Segrate-Milano 2 (IT) BORGONOVO, Flaminio I-20063 Cantu (IT)	(72) Inventors: TOBAGI, Fouad A Los Altos, CA 94022 (US) FRATTA, Luigi I-20090 Segrate-Milano 2 (IT) BORGONOVO, Flaminio I-20063 Cantu (IT) (74) Representative: Horton, Andrew Robert Grant  BOWLES HORTON Felden House Dower Mews High Street Berkhamsted Hertfordshire HP4 2BL Berkhamsted Hertfordshire HP4 2BL (GB)